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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ea97e3a53ce011c3c604d132b73f77a2c7df3d02b918eb4aa4e6ec1e74cae4' 
  AND token = 'qNYDrMLGdG0th8jqmnu+6ghOp1yWPK421AKnkghX3P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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