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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689b5b21c407136795b81b8b4086445daedf5cd311b206fdae30fb790b83de3e' 
  AND token = '5/m2Io28iVes5ZFiU/mocwFGAj39quCD65wz74N88ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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