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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84aeeee442a9b9e1920bd0bcf092f711b9a21a83eba9fc79ae30b7ad4e816f7b' 
  AND token = '+lpXIj6f7pjfYZW1usWjxa526FRDoVyGqIQfBkjpkwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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