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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc334bee463975144fdd28e1faa546f18e2a72f5c91b39b92bc839c6ffa0985' 
  AND token = 'pI/sRpm+Dbdb/K8ap7uIZsp238x3kD98x3JUnWFCxYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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