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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02393ef4f3fc12f4f173dc3323d2b3aaf58390fd7e86f5488acb57ff152dc577' 
  AND token = 'wpmjIGXXHpLbOifa0DKIV/IusXScnnHYTUsONCOW0ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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