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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12e30de1b1b1ea83d6f63eb67b88a1e98103c80dc3b6ff736bc4ac2d4389dea' 
  AND token = 'aCed9lHjyuYz9k0Hk/US+a4i19xwIFpEI/ue7kP/cAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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