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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09357b568abab05385aa24ab1ab2c8497a4d3b8f66040cf1754196b9cd08d29' 
  AND token = 'JbXFoCJ2koNYpmEW6Su9YFFWqomy3+xIdv7WqUqWEYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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