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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10a61f4d5d5af3809fc624191b00766d25b377ab22463ec5c90461543fde9e7' 
  AND token = '0Ty6shmiXfCAIUeUZ5hvEDhvbfgZfyS87GXohIrOX9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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