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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c514d05916b32ef2d77ab06b7db362c3de74163ec03da97304bbe0c778cad6f8' 
  AND token = 'q8rT5EZNSZDALkMI1KrHoUbM1qPSY6eojwch3mtxmjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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