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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3966298d86f3a35069cb42f1ece13c1fec2a318f55625037d6fd5b3d1184abfa' 
  AND token = 'pmqd2XLQSX9vve55V5XnQU8D+doJt4w0UUfd8W47eJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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