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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd5466cd265d4e80cced59a032aa46f6b6fa613c8e23e365b66948ed4943df0' 
  AND token = 'JlZR2qKzwZEQdP4D9j53dziBShLYwkftTUjR5tL+xvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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