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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970a25c590b56cca41e750e45b86bc4f620db4d0e037e56894d5d33f51f5def3' 
  AND token = 'wc9rO9OdA4YWCT28wn8HEcsdPUf+68FhwUCfbDIdwB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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