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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b701f2880701b035cc18977f54f1be1afaa95eda5db98531f3b5a69d9990492' 
  AND token = '/6612E/qRhEGRBklWs3cSOM5FH3VsxslP0buhMdH7jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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