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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb963b5de6c25919b52a39e14aeb50ab00823451d523f97085932dbba9657e4b' 
  AND token = 'YT6x7aKlr3P1c186q8FEVXyS8SCubWEfpFtkoW5xCkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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