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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546914366c54f8d3145ed2bbe2e5b40092b88612c16d0244563402a5eb0d491c' 
  AND token = '7Wc4sc62ppcvLPcbpWMkZVB83VAgKGNS7y9nPlkyCnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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