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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c684b72da01946c191bb884cafd0f4b944f7fa6573364e560c14e3dffcb020' 
  AND token = 'AltI3I0elVhVecYMIyFESQnqzWq1SOlF/edkHDyq3DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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