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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507b3dec836c2c771cb553325af2a5d1d478ff84c3f47e7e638920a119e0ab1e' 
  AND token = 'DsytcjP5hADsKR1tZrdpP7cfD2uuqv6pQcLAIVoV1p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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