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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6830d33f8c9cb3926cf7b32c1f21a26f9b4876707beafa671cc760dbd285490a' 
  AND token = 'Xq0rZsSQFnCtpObt5c6TTFvz+VrImnIpni22Du6qdKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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