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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8d64aafc2bb848c45073039976130fb6442c388d64e0c7e3887b63c0f43eaa' 
  AND token = 'FVjU3JlgV7pvEE3Ots5kX4DpzHyth0dVICfldR6c+yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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