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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e78810415b6c2b2c7242a9aadda3d151981e10eacecb2833015a7036b670cb' 
  AND token = 'tSurfxjJbOx6A4etYV9qfKreOxctpaawxCtJUv1W6Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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