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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9f150852b360fa99dabe931c4ff5648ea53b6919938e67a6bd78efd68b3155' 
  AND token = 'G3iDhfuuuPWFU20K5rxZBy8EKtVj6f+QtdRRU08OXM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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