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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441df145e2b231494004ddc783ee614165c5299c1d5ce6af302727f479aa97bf' 
  AND token = '9feSeatrV5GCEVuhrB/n75uHT3gnlojgvp0aOGi4Ez8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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