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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103484a6a797f72ad188a146e51fefe9288bc9ea7ecd55c463289bcd34a0b444' 
  AND token = 'vQhyie0AoW5Jq5MhfiKGkdNimCZZo10MGnMFdTu44UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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