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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafc92d1e39065ba223a6525eed366799b3f356d4d75d56403190f9c436df16e' 
  AND token = 'DwKsTWOoTXF/Buf/eqOuyir9TUnTKDmjAIlXMLwMi4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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