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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f61c6d88955fa5ea80848941a25372625a2d50d401ff0b2eeda7249296aaba' 
  AND token = 'uo69WEmUDC0IoX9f2XoxxfkRu9kyxBAmQ98b4BbyZXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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