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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce57bc6a3dfc4b3bfbc20d98955db7b4cd9acdb3b377f7763d0e45cf2e149d83' 
  AND token = '1Cbc/7mVfwydbZDoYyHyN1gCCS0VR+laXvqpg4EG2oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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