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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979854e1b3a7a18a0a4a6e140466079730ccba76d83441db22232abf9a9dd252' 
  AND token = 'Zy1SxHpXGASxhvPaXdDSf+5xy8ef9bFDbWR9FxBh4yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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