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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd7502765e5555b2181aba043658da3f8e8c2a3ccabb18488cc670e18e3c289' 
  AND token = 'qBco/OYs5pba8fPrVgK/7kyfmB0/Vp44/9uLetgVT+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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