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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37bb8756ac4f46e74eb8380341622051e1470d83db2c179ce7312a23ac1c4c89' 
  AND token = '7UGpKnurTrb1k8ZuNyFDJ5pg4mZN4FHigfEtCn7OJNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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