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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cfb0aa331fe4b05be16ff0dd24774925f6db91df1c6bb9c2530d90d2eb47b9' 
  AND token = '0B2enB+cxGJmF73SDbe/Tv3LGjueS0Ids71FwuqO0z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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