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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b376dc5ddddaa3dfdef6a096537ef7fa651bd39fccc766a0e8f2b6aa5af89d' 
  AND token = 'G5eSPAb3toJjruxc4h2JvW8nk15n51gL7yBbhE/RKFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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