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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f2815b71764ac5955c23e858d91a2121874e5391104425e70689cd641f29ae' 
  AND token = 'okhp+9tWFWbbYY0DrUMnk4xzKS2qLM3yDANsQbudS4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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