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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6135f53cb0e97146e37e456c5ba574f02d00cba4ea82b9072f83a86f758ff71' 
  AND token = 'gBjQET9hAGsprTWWefY/wsSi4QbsasTXnvQkRzVnA5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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