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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef2ef4a0c664f2582a0f91bbe81f79b1de7ddf05c2b581d6cb855dc18e2a56f' 
  AND token = 'PYgROb3q0nqmcjzlYQk789uJWJRoHvPBNiUQGf3y9FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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