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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faaaccf0bd06b476e9e56aab3d8920e2f21317a3fd8f5f12d68724f4c0be5831' 
  AND token = 'wLiwRrgdrxy6PjuTvO2qTrxbJ9r24E9GkMbJXi8VVHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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