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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f3adec9c536c342f81c53c8c88d6fcc14e8a4b08005f9049e6ba28f396fee9' 
  AND token = 'xToDBDtpYNgD5mW8U0efYDuFWo5KzB68TJdRTd4mVDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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