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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab43381bf1de242e4e36c85e528ebe415b0a6752d965694803de51f180deb41' 
  AND token = 'orCjxTB7n6kj3fI/sxYejCPCqvI5s3+KbxKO6ZyxGsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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