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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37915fd64e9c0e4b5c967f3ce1a5f0ef0d6d8e0052eefd9149c2a0d43ca84896' 
  AND token = '8eMlALQXyQnZQYhNFjNzXO27mUIbHtcVRik1ubt4Ar0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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