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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb74b5318334f25502c8b3df16bc45b6ef35f10ad7f1dd1374fe84931b6f1ec' 
  AND token = 'MWiI5qfbf0jeYFLqMouPIK3E3LmFzb1GDxIej5VL7CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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