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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ec033fd5c75407acb836633a7be4201be9afef461bcfd297d6f4461edb70aa' 
  AND token = 'n+szb+KWsvTL6MHy8abVpTX0irA78sFjZjLpkmwxaoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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