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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c343537276c607ae8420c6ec905415fb1ecb6db1de40f985df12a62dcf90deb' 
  AND token = '0u/cP2oCn13wKIEv4MdLWKf4xv9/OtyExYJwvbEgFu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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