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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91493ba8053c0aadbcc82a11885cdac2d3d894fe57bf7af8561b2020fbb43b8' 
  AND token = 'Q1qmeY7SaQTHFoZNP/Dm40g4nrjabRAkbkEiy0pu1ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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