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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1989dc1ffa942202549cbd9d2a58ce38cbaab5ccbc8b9bcb5fa09c6a8e725b0' 
  AND token = '8CriN2Vd81TewghjUU1gCGfHVHW8F6uJix3Uw0o4bUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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