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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207be85cfc1aa5f8344d11cc62a5bd04dd0388cb3465b572df3e4fb6bb842f1d' 
  AND token = 'g6q4icHT7wt8FJahxXjXmSsonm5JLX9icRDrKGsB9WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}