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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36a3c506fb9de976f59fdeeb4a1bf775dff07b00132227cb94be5000cabfd2f' 
  AND token = 'rSwEb8GuXH96kgyWE408+KOceoA9ApOa0MkuMZTqP58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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