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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d529a1436d5a81b7c85e298ef2441d31754c4bb0e65f75be5fc63b7dd9a9b3b' 
  AND token = 'keNYO/GPePn+R7GR8E6edsHBYs8i+6Tm6vS8Pcb+4mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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