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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1fe6e32923f033b44ede60b4b43e891a207dcce46eaf15c2d2ca5c9a3316d6' 
  AND token = 'pTMc32y4+q/f1EgOFpRin3vyO2Ox46GSekxL3Hlzh9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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