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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d01dc182eeabb6b3ce1333e209a09e203200cf7c3ebbf506938f3b3378bb5a' 
  AND token = 'x+4q8dICdJlHclO08Qji1ELNETiDYXi4QGqsAjcvbqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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