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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7b9a8061a201c9838d5498eb38cedd544d55a791c2f16fbff21cbaa74e33e5' 
  AND token = 'K/OWaumvCeF2Q23jEjH0XqeCDpid2vGlX5n2mdCgH2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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