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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762a2bc0c7d4dc8dc068c9955229c20ff0d69e6879fadc7a90eaee6225ec031d' 
  AND token = 'qjGTdhrDBcMkAwWssrLTmV6E7FB9QE7ZUEBDYt1+FZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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