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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4ae65aed923a07d6ed91b1cec0fbd31b3cb627f777e8d0c8b4dd97f1a9a919' 
  AND token = 'PJ/362fKYnkSrTG10X0FHN3DA73OYZupXQ+hGBz6INo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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