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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca72d207c7367c205ed69032402e8e3141b29b7e757a45bf58724786004795fa' 
  AND token = 'Bw/S6JEVi4dpSbbTwnc55fnMIK+LN3NOGO6V/EEXaVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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