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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecadf3eb4aab1b7d3dee30999275c65eced3d0c3c94080a28dd84eb3cc7ed48' 
  AND token = 'sz+jXJjV09/ER7MImoOwBMLP2COSbMZsohozG31Pz+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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