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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f61592746f0f1d9e925bbfd039fa0b95a55dc81c0c52d49fa404b1d1c7177c' 
  AND token = 'j01M9uDqSGIjcdsSPOJoPkb0gZM9cKQm9TGG/TjOO1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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