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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0961ea90da23882b9f11e7a6ddea371ebaaf3c686528a7c289ea5e209df555' 
  AND token = 'bXCl899ayIO29jKsjdKa+N2H4C/FFvCBDMknU3v1JoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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