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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbd7e031fd8b48a56115ef90c9eb78ad3f4f5fbd9970cd996f1136d900b9d89' 
  AND token = 'iCrPO7YYBdW+Z7NMbrB+W4MbhdQxtqV9GAUYqMNdqOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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