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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48953c3d9f6db0ed5e2b69ddbca2ab0d5f9c5ad33cb0d4d9922ba9e87e5b0d2b' 
  AND token = 'EtVaWTY88RJ3Ee9/a+A0t2lV7p+BDoCFVz/N/GOXDqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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